The royal could be seen swallowing hard as his gaze moved nervously around the room during his engagement this afternoon

Prince Harry was visibly shaken as he delivered a six-minute address at an Invictus Games event this afternoon, having just learned of his legal defeat.

The Duke arrived at the basement venue in Chatham House at almost the precise moment the court judgment was made public.

Harry lost his £50 million privacy lawsuit against Associated Newspapers Ltd, the company behind the Daily Mail.

Mr Justice Nicklin delivered the High Court judgment today, throwing out all allegations brought by the royal and six other prominent figures.

Sir Elton John, actress Liz Hurley and Baroness Lawrence were among those who joined Harry in accusing the publisher of illegally intercepting phone communications and obtaining confidential medical information through deception.

The judge concluded that those bringing the case had depended too heavily on "inference", stating that "suspicion, even where understandable, was not enough" to establish wrongdoing.

The court also rejected the notion that private information appearing in print without an explained source automatically indicated unlawful methods had been used.

The prince spoke of determination and the unconquerable spirit that defines the Invictus competitors.

"The same instinct to keep moving forward, even when the road ahead looks uncertain," he declared with emphasis.

The Duke closely followed his script, beginning with a lighthearted quip about the warm weather before acknowledging his return to the Invictus world.

Broadcaster Petroc Trelawny, who was hosting the event, offered him a warm greeting: "I know, sir, everyone is delighted that you're here with us today."

Throughout the two-hour symposium focused on military veterans and recovery, Harry took his seat among his team and attempted to concentrate on the proceedings.

His aides glanced towards him repeatedly as the session progressed.

The prince has had little time to process the full weight of the ruling, with its significance likely dawning on him as the afternoon unfolded.

A formal response is anticipated, potentially including an appeal or criticism of the judgment.